Download Investigating Earth’s Polar Biomes (Introduction to Earth by Sherman Hollar PDF

By Sherman Hollar

The sub-zero temperatures and glacial stipulations to which the polar areas of the Earth are usually topic could make it tough for lots of people to outlive there for lengthy sessions of time. but existence is found in either the Arctic and Antarctic, and the entice of getting to know new territories and assets has attracted either researchers and explorers to those icy expanses. Readers will trip along the various early expeditions and should find out about the stipulations and lifestyles that contain the polar ecosystems.

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Four species of seals breed almost exclusively in the Antarctic. They are the Weddell seal, which ranges as far south as the sea 54 Geography of Antarctica does and can dive as deep as 2,000 feet (600 meters) for nearly an hour; the crabeater seal, which spends most of its time around pack ice (sea ice); the leopard seal, which favors penguins as its food; and the Ross seal, rarely seen. Other Antarctic species include the fur seal and the huge elephant seal. Most populous is the crabeater, whose numbers are estimated to be in the millions.

Other Antarctic species include the fur seal and the huge elephant seal. Most populous is the crabeater, whose numbers are estimated to be in the millions. Weddell seals by comparison number only 500,000. The others exist in even smaller numbers. A leopard seal rests on an ice floe in Antarctica. com 55 Investigating Earth’s Polar Biomes Fishes peculiar to the Antarctic include the Antarctic cod and the icefish. These and other Antarctic fish have developed blood that enables them to live in seawater as cold as 28° â•›F (–2 °C).

In the summer of 1918 Amundsen once again set sail for the Arctic, in the newly built ship Maud. He planned to drift across the North Pole from Asia to North America, but he failed in this purpose because the ship was unable to penetrate the polar ice pack. Two years later, however, when Amundsen reached Alaska, he had sailed also through the Northeast Passage, by way of Siberian coastal waters connecting the Atlantic with the Pacific. After he had sent the Maud back to the Arctic to continue observations, Amundsen turned to the project of flying over the North Pole.

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